1. $$\frac{1}{5}+\frac{1}{3}$$ 2. $$\frac{1}{2}+\frac{3}{8}$$ 3. $$\frac{3}{4}+2$$ 4. $$\frac{2}{3}-\frac{1}{6}$$ 5. $$\frac{7}{12}-1$$ 6. $$\frac{4}{5}-\frac{9}{10}$$ 7. $$\frac{1}{3}-\frac{1}{2}$$ 8. $$1+\frac{7}{3}$$

Решение:

1. $$\frac{1}{5}+\frac{1}{3} = \frac{3+5}{15} = \frac{8}{15}$$
2. $$\frac{1}{2}+\frac{3}{8} = \frac{4+3}{8} = \frac{7}{8}$$
3. $$\frac{3}{4}+2 = \frac{3+8}{4} = \frac{11}{4}$$
4. $$\frac{2}{3}-\frac{1}{6} = \frac{4-1}{6} = \frac{3}{6} = \frac{1}{2}$$
5. $$\frac{7}{12}-1 = \frac{7-12}{12} = -\frac{5}{12}$$
6. $$\frac{4}{5}-\frac{9}{10} = \frac{8-9}{10} = -\frac{1}{10}$$
7. $$\frac{1}{3}-\frac{1}{2} = \frac{2-3}{6} = -\frac{1}{6}$$
8. $$1+\frac{7}{3} = \frac{3+7}{3} = \frac{10}{3}$$

Ответ: 1. $$\frac{8}{15}$$; 2. $$\frac{7}{8}$$; 3. $$\frac{11}{4}$$; 4. $$\frac{1}{2}$$; 5. -$$\frac{5}{12}$$; 6. -$$\frac{1}{10}$$; 7. -$$\frac{1}{6}$$; 8. $$\frac{10}{3}$$.